JPH04353631A - Optical disk - Google Patents

Abstract

PURPOSE:To record or reproduce information of high quality without reducing an efficiency even when a plurality of data having different transferring speeds of necessary data, are mixed. CONSTITUTION:A data area 16 of an optical disk 10 is divided into a plurality of areas 16a-16d, and information such as a dynamic picture, a static picture, a voice, etc., having different transferring speeds of data necessary for the respective areas, are recorded. Address and data transferring speeds of the data recorded on the respective areas 16a-16d are recorded in a directory 14.

Description

[Detailed description of the invention] [Industrial application field]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc, and particularly to an optical disc on which a plurality of types of data such as moving image data and audio data are recorded.

0002

[Prior Art] Conventionally, various types of optical disks such as read-only type, write-once type, rewritable type, and partial ROM type have been controlled by constant linear velocity (CLV) or constant rotational angular velocity (CAV). The data transfer rate, which is the data recording and playback frequency, is kept constant.

0003

[Problem to be Solved by the Invention] However, in recent years, optical discs have become popular as they can record large amounts of data, and as they have become more widespread, they have come to be used as multimedia. Various types of data such as videos, still images, and audio are now being recorded in a mixed manner. However, when recording and reproducing a series of data blocks for information consisting of moving images, still images, or audio, the desired data transfer speed differs significantly.

[0004] That is, for example, when recording audio information,
When playing back data, data is transferred at approximately 1.4 Mb/s on a compact disc (CD). However, in the case of moving images, in order to obtain clear images like those seen on television, a data transfer rate of at least about 10 Mb/s is required. For this reason, conventional optical discs are limited to a constant data transfer speed, so when multiple types of data such as moving images, still images, and audio are mixed, the fastest data transfer speed is required (for example, for moving images). or set to the slowest data transfer rate (for example, audio data transfer rate).

For this reason, if the data transfer rate is set to the highest, and audio information that requires a slower transfer rate is recorded, a large amount of blank data will be created, reducing the recording density of the disc and causing the disc to become unusable. Reduces recording efficiency. Conversely, if the data transfer rate is set low, extreme data compression must be performed when recording moving image data, resulting in deterioration of information quality (image quality or sound quality).

[0006] The present invention has been made in order to eliminate the drawbacks of the prior art described above, and even when a plurality of data having different required data transfer speeds coexist, efficiency is reduced. The purpose of the present invention is to provide an optical disc on which high-quality information can be recorded or reproduced.

[0007]

[Means for Solving the Problems] In order to achieve the above object, an optical disc according to the present invention has a data recording area corresponding to each type of data in an optical disc on which a plurality of types of data are recorded. It is characterized by having a data designation area which is partitioned in the radial direction and records at least address information indicating the position where each of the data is recorded and a data transfer rate corresponding to each of the data.

[0008] In the data recording area, a reference signal can be recorded near the recorded data for making the transfer rate of this data match the data transfer rate recorded in the data designation area.

[0009]

[Operation] The present invention configured as described above divides the data recording area for recording data in the radial direction, for example, a portion for recording video data, a portion for recording still image data, and a portion for recording audio data information. It is divided into parts, etc., and data with different data transfer speeds are recorded in each divided area. Then, for example, a data specification area for searching is provided on the outermost or innermost side of the disk, and in this data specification area, address information indicating the position where the data is recorded and data corresponding to the partitioned area where the data is recorded are stored. Write down the transfer speed.

[0010] Thus, when recording and reproducing data such as moving images, still images, audio, etc., the data transfer rate can be made suitable for each type of data by changing the rotational speed of the disk, for example. Therefore, it is possible to prevent the recording efficiency of the optical disc from being reduced due to the creation of data blanks, and the deterioration in the quality of information due to extreme data compression, as in the prior art.

[0011] Furthermore, if a reference signal is recorded in the data recording area to match the data transfer rate to the data transfer rate recorded in the data designated area, data can be transferred easily and reliably at a predetermined transfer rate. .

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the optical disc according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of an optical disc according to an embodiment of the present invention. The optical disc 10 is, for example, a magneto-optical disc on which data can be rewritten, and a directory 14, which is a data specification area for searching data recorded on the optical disc 10, is provided at the innermost side of the recording area 12. The outside of the directory 14 is a data area (data recording area) 16.

The data area 16 is, as shown by the broken line,
It is divided into a plurality of areas 16a to 16d in the radial direction, and types of data with different data transfer speeds are recorded in each area. For example, moving image data is recorded in area 16a, still image data is recorded in area 16b, audio data is recorded in area 16c, and character data is recorded in area 16d. Note that the reference numeral 18 shown in FIG. 1 is a center hole for mounting the optical disc 10 into a recording/reproducing apparatus.

As shown in FIG. 2, the directory 14 contains file names that specify data recorded on the disk, and
A sector address, which will be described later, indicating the location where this file was recorded, and a data transfer speed for transferring the data of this file are recorded.

Each area 16a-16d is divided into sectors of a predetermined length, as shown in FIG. Each sector has a preformat section 2 formed in advance at the beginning.
0, and a data section 22 for writing data. The preformat section 20 records a preamble section for bit synchronization, a sector synchronization signal, a sector address, etc. (none of which are shown).

The data written in the data section 22 is divided into frames of a predetermined length, and a reference signal is placed at the beginning of each frame to match the data transfer rate with the data transfer rate recorded in the directory 14. For example, a frame synchronization signal consisting of 8 bits is recorded, so that frame reading synchronization can be achieved when data is reproduced. Note that a preamble section (not shown) is provided at the beginning of the first frame following the preformat section 20 to ensure bit synchronization.

Optical disc 1 of the embodiment configured as described above
0, for example, to record video information, move the optical pickup of the recording device (not shown) to the directory 14, enter a file name that specifies the video information in the data name column shown in FIG. Then, the address and data transfer rate of the sector in the area 16a are written. Thereafter, the optical pickup is moved to the area 16a of the data area 16, and the rotational speed of the motor for rotating the optical disk 10 is increased to control the rotational speed of the optical disk 10 so that the data transfer speed written in the directory 14 is obtained. Then, the sector address is read by an optical pickup, and the video information data is written in frames of a predetermined length at a predetermined address. At this time, the frame synchronization signal shown in FIG. 3 is recorded at the beginning of each frame.

When reproducing information from the optical disc 10 of the embodiment, an optical pickup of a reproducing device (not shown) searches the directory 14 for a file of the target information, and searches for the address where the file is recorded. Read the data transfer speed. Next, the playback device moves the optical pickup to the read address and controls the rotational speed of the motor of the playback device so that the transfer speed of the data recorded on the optical disc 10 is the same as the data written in the directory 14. The optical disc 10 is rotated to match the transfer speed. Then, the playback device reads the synchronization signal recorded at the beginning of each frame, synchronizes the readout of the frames, and controls the drive of the motor so that the data transfer rate becomes a predetermined value.

As described above, in the embodiment, the data area 16 is divided into a plurality of sections in the radial direction, and necessary data such as moving images, still images, audio, etc. are transferred for each sectioned area 16a to 16d. Since data is recorded at different speeds and the address and data transfer speed of each area 16a to 16d are recorded in the directory 14, recording and playback can be performed at a data transfer speed suitable for the type of video, still image, audio, etc. can do. In this embodiment, the data transfer speed is changed by dividing into a plurality of sections in the radial direction, but even if the same track (within one rotation) has different data transfer speeds, this embodiment of the present invention can also be used. be. In this case, there are cases where the rotation speed is adjusted multiple times within the same track.

That is, even when multiple types of data such as moving images, still images, and audio that require different data transfer speeds are mixed, the efficiency of the optical disc 10 is reduced because blank areas where no data are recorded occur in the recording area. This can prevent the quality of information from decreasing due to extreme data compression. Furthermore, by recording a frame synchronization signal, which is a reference signal, near the data recorded in frames, the data transfer rate can be easily and reliably matched to the data transfer rate recorded in the directory 14.

FIG. 4 shows another embodiment. In the optical disc 10 of this embodiment, a directory 14 is formed at the outermost part of the recording area 12. The rest is the same as the embodiment shown in FIG. In this embodiment as well, the same effects as in the previous embodiment can be obtained.

In the above embodiment, a rewritable magneto-optical disk has been described, but the present invention can also be applied to other optical disks such as a read-only type, a write-once type, and a partial ROM type. Furthermore, in the embodiment described above, a case has been described in which the area for recording video data is outside the recording area 12, and the area for recording character data is inside the recording area 12. The area for recording audio and text data can be set at any position in the recording area 12. In the above embodiment, the case where each data such as a moving image, still image, audio, and text is recorded in one area is explained, but an arbitrary number of recording areas can be set for each type of data. can do.

Furthermore, in the embodiment described above, a synchronization signal consisting of 8 bits is provided at the beginning of a frame consisting of data of a predetermined length, in which a so-called synchronization signal is concentrated. to “0”
A so-called distributed arrangement method, in which "1" and "1" are arranged alternately, may also be used.

[0025]

As explained above, according to the present invention, the recording area is divided according to the type of data, and the address and data transfer rate of the recorded data are recorded in the data designated area. Even if there are different types of data that require different data transfer speeds, such as still images, audio, etc., when recording and reproducing them, the data transfer speed should be appropriate for each type of data. This can prevent data blanks from occurring and the recording efficiency of the optical disc from decreasing, and information quality from deteriorating due to extreme data compression.

[0026] If a reference signal is recorded in the data recording area to match the data transfer rate to the data transfer rate recorded in the data designated area, data can be transferred easily and reliably at a predetermined transfer rate. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an optical disc according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of the directory shown in FIG. 1;

FIG. 3 is a schematic explanatory diagram of a data recording format.

FIG. 4 is an explanatory diagram of another embodiment in which a directory is provided on the outside.

[Explanation of symbols]

10 optical disc 12
Recording area 14
Data specification area (directory) 16
Data recording area (data area) 16a to 16d area

Claims (2)

[Claims] 1. In an optical disc on which a plurality of types of data are recorded, a data recording area is divided in the radial direction corresponding to each type of data, and at least address information indicating a position where each of the data is recorded is provided. , and a data transfer rate corresponding to each of the pieces of data. 2. In the data recording area, a reference signal is recorded near the recorded data for making the transfer rate of this data match the data transfer rate recorded in the data designation area. The optical disc according to claim 1, characterized in that: